Bending machine of self-locking crank connecting rod mechanism

Abstract

The utility model discloses a bending machine of a self-locking crank connecting rod mechanism, which belongs to the technical field of bending machines and comprises a machine frame, an upper cutter block is arranged on the machine frame along the vertical direction in a sliding mode, two ends of the upper cutter block are respectively provided with a driving mechanism, and each driving mechanism comprises a rotating disc fixedly connected on the machine frame and a connecting rod eccentrically hinged on the outer side of the rotating disc. When the upper cutter block is located at the lowest position, the center of the rotating disc is located on a center shaft of the connecting rod, the self-locking crank connecting rod mechanism is in a locking state, and under the condition that torque is not applied to the rotating disc, the rotating disc can rotate around the rotating disc. And the self-locking crank connecting rod mechanism is continuously in a locking state, so that the upper cutter block continuously pressurizes the bent metal plate, and rebound is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of bending machines, in particular to a bending machine with a self-locking crank-connecting rod mechanism. Background Art

[0002] A press brake is a machine that can bend thin plates. It uses the molds it is equipped with to bend cold metal plates into workpieces of various geometric cross-sectional shapes. It is a sheet forming machine designed for cold rolled sheet metal processing.

[0003] The existing bending machine adopts a direct pressure method, which requires a lot of pressure on the upper blade to overcome the rebound of the metal sheet after bending. Therefore, the existing bending machine requires relatively high-power equipment, high energy consumption, heavy equipment, and is inconvenient to produce and use, and needs to be improved. Utility Model Content

[0004] In view of the above problems, the present invention provides a self-locking crank-connecting rod mechanism to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A bending machine with a self-locking crank-connecting rod mechanism includes a frame, an upper knife block is provided on the frame for sliding in the vertical direction, a driving mechanism is provided at each end of the upper knife block, the driving mechanism includes a turntable fixedly connected to the frame, a connecting rod eccentrically hinged to the outer side of the turntable, the top of the connecting rod is rotatably connected to the upper knife block, the two turntables are connected by a transmission roller, the transmission roller is connected to a motor and driven by the motor, when the upper knife block is at the lowest position, the center of the turntable is located on the central axis of the connecting rod.

[0007] Preferably, the motor is connected to a planetary reducer, and the planetary reducer is connected to the transmission roller.

[0008] Preferably, the turntable is a gear, and the turntable is engaged with the transmission roller.

[0009] Preferably, the connecting rod includes a main rod and two connecting heads located at both ends thereof, the two ends of the main rod are respectively threadedly connected to the connecting heads, and the two connecting heads are respectively hinged to a connecting shaft and the upper knife block.

[0010] Preferably, the upper blade block is provided with a limiting ring, the frame is provided with a strip hole along the vertical direction, the limiting ring is slidably connected in the strip hole, and the limiting ring and the strip hole cooperate with each other.

[0011] Beneficial effects of the utility model:

[0012] When the connecting shaft runs to the lowest point of the running track, the center of the turntable is on the axis of the connecting rod, and the self-locking crank-connecting rod mechanism is in a locked state. When no torque is applied to the turntable, the self-locking crank-connecting rod mechanism remains in a locked state, making it easier for the upper knife block to continuously apply pressure to the bent metal sheet to eliminate rebound.

[0013] A relatively small power motor can be used to drive the self-locking crank-connecting rod mechanism. By locking the self-locking crank-connecting rod mechanism, the metal sheet can be bent and springback eliminated, with low energy consumption, and reduced manufacturing, transportation and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a first perspective view of the embodiment;

[0015] Figure 2 is a second perspective view of the embodiment;

[0016] Figure 3 is a front view of an embodiment;

[0017] Explanation of the accompanying symbols: 1. turntable; 2. connecting rod; 3. connecting shaft; 4. upper cutting block; 5. motor; 6. planetary reducer; 7. transmission roller; 8. connecting head; 9. limiting ring; 10. strip hole; 100. frame. DETAILED DESCRIPTION

[0018] The technical solution of the present utility model is described below with reference to the accompanying drawings and embodiments.

[0019] Example: Reference Figure 1-3, a bending machine with a self-locking crank-connecting rod mechanism includes a frame 100, the frame 100 is provided with a strip hole 10 in the vertical direction, and an upper knife block 4 is provided on the frame 100 for sliding in the vertical direction. A driving mechanism is provided at each end of the upper knife block 4. The driving mechanism includes a turntable 1 fixedly connected to the frame 100, and a motor 5 is provided at one end of the frame 100. The motor 5 drives the transmission roller 7 to rotate, and the two ends of the transmission roller 7 drive the turntable 1 to rotate synchronously. A connecting shaft 3 is eccentrically provided on the surface of the turntable 1. The connecting shaft 3 makes a circular motion under the drive of the turntable 1, and one end of the connecting shaft 3 is hinged to the connecting rod 2. The other end of the connecting rod 2 is hinged to the upper knife block 4. One end of the connecting rod 2 follows the connecting shaft 3 for circular motion, and the other end makes a reciprocating motion up and down in the strip hole 10. When the connecting shaft 3 moves to the highest point or the lowest point of its circular motion trajectory, the center of the connecting shaft 3 is at the connecting rod 2, the torque driving the turntable 1 to rotate is zero. In the absence of new torque, the crank-connecting rod mechanism is in a locked state, and the upper knife block 4 is at the highest or lowest point of the stroke. When bending the plate, the knife block 4 moves downward to bend the plate to be processed. When the knife block 4 moves downward to the lowest point, the center of the connecting shaft 3 is on the axis of the connecting rod 2, the motor 5 stops outputting, the crank-connecting rod mechanism is in a locked state, and the knife block 4 continues to press the bent plate until the rebound of the metal plate is eliminated. Through the locking function of the crank-connecting rod mechanism, only a smaller power motor 5 is needed to eliminate the rebound of the metal plate, while the existing bending machine adopts direct output of the drive motor, which requires a high-power drive motor to complete the bending and eliminate the rebound. The motor 5 used in this technical solution has a smaller power, which reduces the cost of the drive motor, and the cost of equipment, transportation, and use is also reduced.

[0020] Specifically, the motor 5 is connected to a planetary reducer 6 , and the planetary reducer 6 is connected to the transmission roller 7 . The planetary reducer 6 can increase the torque, thereby increasing the force acting on the transmission roller 7 .

[0021] Specifically, the turntable 1 is a gear, and the turntable 1 is engaged with the movable roller 7, so that the movable roller 7 can drive the turntable 1 more sensitively.

[0022] Specifically, the connecting rod 2 includes a main rod and two connecting heads 8. Screw holes are provided at both ends of the connecting rod 2. The connecting heads 8 are provided with screws that match the screw holes. The two ends of the main rod are respectively threadedly connected to the connecting heads 8. The two connecting heads 8 are respectively hinged to the connecting shaft 3 and the upper knife block 4. During use, the threaded connection depth of the connecting heads 8 at both ends can be adjusted by twisting the main rod, thereby adjusting the length of the connecting rod 2 to ensure that when the connecting shaft 3 is at the lowest point of the circular motion, the center of the turntable 1 is located on the axis of the connecting rod 2. Moreover, the main rod and the connecting head 8 are processed separately to improve the processing efficiency. The length of the connecting rod 2 can be adjusted to avoid the crank-connecting rod mechanism from being unable to self-lock due to the processing error of the connecting rod 2.

[0023] Specifically, the upper blade block 4 is provided with a limiting ring 9, which is slidably connected to the strip hole 10. The limiting ring 9 cooperates with the strip hole 10 to ensure that the upper blade block 4 only moves back and forth along the strip hole.

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] The above describes in detail one embodiment of the present invention, focusing on the structure of a bending machine with a self-locking crank-connecting rod mechanism. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A bending machine with a self-locking crank-connecting rod mechanism, comprising a frame (100), an upper blade block (4) being provided on the frame (100) for sliding in a vertical direction, characterized in that: A driving mechanism is provided at each end of the upper blade block (4), the driving mechanism comprising a turntable (1) fixedly connected to the frame (100), a connecting rod (2) eccentrically hinged to the outside of the turntable (1), the top of the connecting rod (2) being rotatably connected to the upper blade block (4), the two turntables (1) being connected via a transmission roller (7), the transmission roller (7) being connected to a motor (5) and driven by the motor (5), and when the upper blade block (4) is at its lowest position, the center of the turntable (1) is located on the central axis of the connecting rod (2).

2. A bending machine with a self-locking crank-connecting rod mechanism according to claim 1, characterized in that: The motor (5) is connected to a planetary reducer (6), and the planetary reducer (6) is connected to the transmission roller (7).

3. A bending machine with a self-locking crank-connecting rod mechanism according to claim 2, characterized in that: The turntable (1) is a gear, and the turntable (1) is meshed with the transmission roller (7).

4. A bending machine with a self-locking crank-connecting rod mechanism according to claim 1, characterized in that: The connecting rod (2) comprises a main rod and two connecting heads (8) located at both ends thereof, the two ends of the main rod are respectively threadedly connected to the connecting heads (8), and the two connecting heads (8) are respectively hinged to a connecting shaft (3) and the upper knife block (4).

5. A bending machine with a self-locking crank-connecting rod mechanism according to claim 1, characterized in that: The upper blade block (4) is provided with a limiting ring (9), the frame (100) is provided with a strip hole (10) in the vertical direction, the limiting ring (9) is slidably connected in the strip hole (10), and the limiting ring (9) and the strip hole (10) cooperate with each other.

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